Method of making strip shingles



Patented June 10, 1924.

meme

CHRISTIAN C. OLSON, OF MINNEAPOLIS, MINTESOTA, ASSIGNOR TO WILLIAM-EDWIN NELSON, OF MINNEAPOLIS, MINNESOTA.

mn'rrron or Mannie s'rm SHINGLES.

No Drawing.

To all whom it may concem:

Be it known that I, Cmus'rmu'll/L OLSON, a citizenof "the United States, resident of Minneapolis, in the county of Hennepin and I State of Minnesota, have invented certain new and useful Improvements in Methods af-Making Strip Shingles, of which the followin 1s a specification.

In making strip shingles it has been customary to apply mineral coating, and through the layers of asphalt and felt, thereby dividing the coated.-

sheet into strip shingles of any desired size and shape. 'While this is the method universally employed for cutting the prepared sheets into strip shingles, such method is 80 objectionable in that cutting through the mineral'covering quickly dulls the knives, and, moreover, even when the knives are sharp, a smooth out through the mineral coating cannot be made, as the pressure of $5 thekhives on the mineral surface will produce' a'agged or torn edges. This result is much more pronounced and objectionable when the knives become dull, which they quickly do, from cutting through the slate 40' or mineral covering.

I have discovered that by cutting through the felt sheet, and into, but not through,

the asphalt coating, on lines outlining the pattern or configuration desired for the a shingle, the sheet will separate on said lines, the mineral covering breaking or dividing on said lines with smooth, edges. I obviate or dispense with any cutting into, or through, the mineral-covering, and any tearing of such covering or'ofthe sheet, and

produce-strip shingles of any desired outline having smooth, unbroken edges. In carrying out my invention Lpreferably employs. felt sheet having atliiclmess I to one surface ,ofa sheet of felt a 'coatlng of asphalt, or similar ma- Application filed February 10, 1923. Serial No. 618,387.

- of about sixty one-thousandths (/1000 of an. inch.- To this-sheet I apply a coating of asphalt having'a thickness of substantially forty one-thousandths (40/1000) of an inchi To the asphalt coating I apply a mineral covering, preferably crushed slate having a thickness of about thirty-five onethousandths (35/1000) of an inch. I then, by means of a suitable cutting. press-either platen or cylinder-cut through the felt or foundation sheet and partly through the asphalt coating, but not into the mineral I covering. The lines of the cuts, in the felt, outline the shingles; and when the sheets are removed, or pass through the press, the sheets will separate on the lines of the cuts,

the mineral coating breaking through on such lines and producing "separate strip shingles with smooth edges throughout.

- It is necessary in carrying out this invention to cut through the foundation sheet of felt and into the asphalt, but it is not necessary to cut through the asphalt coating nor into the mineral covering, as the fibers of the felt being completely severed on the lines arranged to produce the outlines desired for 'the shingle the asphalt coating and fine mineral or slate covering, both of which are nonfibrous, will break through on the lines of the cuts through' the felt I or fibrous sheet.

I claim as my invention:

1. The process of making strip shingles from a sheet of fibrous material coated on one surface with an adherent material and finely divided mineral material which consists in dividing the sheet into separate strip shingles by cutting through the fibrous sheet and into but not through the coating, then separating the shingles on the lines of the cuts through the fibrous material.

2. The process of making strip shingies from a sheet of felt having on one suriace a coating of asphalt and finely divided mineral material which consists in cutting through the felt material and asphalt but not through the mineral material'on lines to form the shingles then breaking throu h.

the mineral material on the cuts in the felt. r r

In witness whereof, I have hereunto set my hand this 7th day of February, 1923.

cnmsrrnn M. OLSON.

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